Check valve



FIG. 1 is an elevational view of one side of the check valve of thepresent invention, the other side being a mirror image thereof.

FIG. 2 is an elevational view of one end of the check valve of thepresent invention.

FIG. 3 is an elevational view of the end opposite to the end of thecheck valve depicted in FIG. 2.

FIG. 4 is a top plan view of the check valve of the present invention;and,

FIG. 5 is a bottom plan view of the check valve of the presentinvention.

The ornamental design for a check valve, as shown and described.